【英语时差8,16】后视镜的工作原理2

 Imagine holding a plate of glass in front of a regular mirror–you’d still see your reflection in the mirror, but you’d also see a fainter reflection from the plate of glass. In a rear-view mirror, this glass surface is a wedge, pointing somewhat downward. With the mirror in its normal position, the glass surface points down into the driver’s seat. During the day you don’t notice this faint reflection of your lap because the reflection from the main mirror–pointing out the rear window–is so much brighter. When you flip¹ the switch at night, you change the angle of the whole setup. Now the primary surface is pointing up at the dark ceiling of your car, and the glass wedge points out the rear window. You can still see the headlights behind you, but since the glass wedge only reflects a fraction of the light, they appear much dimmer.

1 flip   

vt.快速翻动；轻抛；轻拍；n.轻抛；adj.轻浮的

参考例句：

• I had a quick flip through the book and it looked very interesting.我很快翻阅了一下那本书，看来似乎很有趣。
• Let's flip a coin to see who pays the bill.咱们来抛硬币决定谁付钱。